Perhaps you should try some spelling variations:
nghien huu » nghien cuu, nguyen huu, nhiem huu
sach thoi » cach thoi, sach hoi, sach tham
hoc nhanh » hoc nganh, hoc phan
nhanh hoa » nhanh hoan, thanh hoa, khanh hoa
tan luan » tang luan, toan luan, dan luan
huu mot » cuu mot, huy mot, hieu mot
mot hoc » mon hoc, mo hoc, mot goc
hoc tac » hoc tach, hoc tap, hoc cac
tac hai » tuc hai, tac ha, tai hai
hai tan » hai van, hai quan

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: nuoc ((sach thoi) or (sach nha)) tap, nghien huu mot hoc nhanh hoa hoc tac hai tan luan van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: nuoc ((sach thoi) OR (sach nha)) tap, nghien huu mot hoc nhanh hoa hoc tac hai tan luan van.
• Adding a wildcard symbol may retrieve word variants: nuoc ((sach thoi) or (sach nha)) tap, nghien huu mot hoc nhanh hoa hoc tac hai tan luan van*.